Hand-brake



H. Al WAHLERI.

HAND BRAKE.

APPLICATION HLED AP11-12, 1918.

Lil 2 WLMH|H- 1111511 m... mm Aluminium I INVENTO HARA/0111er@ bY UNITED STATES PATENT OFFICE.

HENRY A. WAI-ILERT, OF ST, LOUIS, MISSOURI, ASSIGNOR TO THE .AMERICAN BRAKE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION 0F MISSOURI.

HAND-BRAKE.

Specification of Letters Patent.

Patented June 15, 1920.

.Application iled April 12, 1918. Serial No. 228,119,

To all whom 15 may concern:

lBe it known that I, I-IENRY A. WAHLERT, a citizen of the United States, residing at St. Iiouis, in the State of Missouri, have invented new and useful Improvements in Hand-Brakes, of which the following is a specification.

This invention relates to hand brakes, more particularly adapted for use on raillway freight cars.

The principal object of my invention is to provide a compact hand brake adapted to quickly take up the slack and then apply the brakes with great force.

In the accompanying drawing, Ifigure l is a horizontal section on the line 1-1 of F ig. 2 of a hand brake device embodying my invention, and Fig. 2 a central vertical section of the hand brake device.

As shown in the drawing, the hand brake device is applied to the usual brake staff I in place of the usual hand wheel and may comprise a hand wheel 2, keyed directly to the brake staff l for winding up the brake chain to take up the slack, and a hand wheel 3 which is operatively connected to the hand wheel 2 through one or more planetary gear trains.

In the construction shown in the drawing, two planetary gear trains are employed, one of which is mounted in the hand wheel 2 and comprises gears l adapted to mesh with a central pinion 5 carried by an intermediate member 6. The hand wheel 2 is provided with internal gear teeth 7 adapted tomesh with the gears 4, said gears being maintained in their relative positions by means of a spacing member 8.

Mounted within the intermediate member 6, are gears 9 adaptedy to mesh with a central pinion l() carried by the hand wheel 3, and with internal gear teeth l1, provided on the member 6, the gears 9 being held in their spaced relation by means of a spacing member 12.

In operation, the hand wheel 2 is first turned to effect the direct rotation of the brake stad l, so as to wind up the usual brake chain and take up the slack, and then gears 4 to the hand wheel 2, which is thereby turned to eii'ect the rotation ot the brake statt l.

The gears 4 and 9 may be made of any desired ratio with respect to the coperating internal gears, and it, for example, the gear ratio of each planetary system is as three to one, then the application of a force v of one pound on the hand wheel 3 will be multiplied to nine pounds at the brake stad l.

'Ihus a quick take up of slack is provided, as well as a high multiplication of force.

The above described construction being applied to the brake stati as a self contained unit in place of the ordinary hand wheel, no modication of the brake chain mechanism is required.

By employing a planetary gear system, the gear pressures are so balanced that the wear on the gear teeth is equally distributed and likewise the wear on the bearings is balanced and reduced to a minimum. Iturthermore, this arrangement of gearing permits the use of parts of ample strength within a limited space.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

l. In a hand brake device, the combination with a brake stad, of a hand wheel directly connected to said brake sta", a power hand wheel, and a plurality of planetary gear systems for operatively connecting the power hand wheel to said brake sta'.

2. In a hand brake device, the combination with a brake stati', of a hand wheel directly secured to said brake stall?, and provided with an internal gear, gears meshing with said internal gear, a power hand wheel provided with a pinion, gears meshing with said pinion, and an intermediate geared member for operatively connecting set of gears meshing with said pinion, and

the two sets of gears. an intermediate geared member having a 10 3. In a hand brake device, the combinapinion meshing with the first set of gears tion with a brake staff, of a hand wheel diand an internal gear meshing with the Secrectly secured to said brake staff and proond set of gears.

vided with an internal gear, a set of gears In testimony whereof I have hereunto set meshing with said internal gear, a power my hand.

hand wheel provided with a pinion, a second HENRY A. VVAHLERT. 

